D6.3.4/0715-0716/E
17
and a potential relay, is needed for proper operation. Assembly must be in accordance with the
position of the relay shown on the wiring diagram.
4.2.2 Three-phase motors
All compressors can be started direct-on-line. The necessary position of bridges for direct-on-line
start (depending on type of motor and/or mains voltage) is shown on the principle wiring in
section 4.3.1.
4.2.3 Direct-on-line start motors
– Code T
This motor is only suitable for one voltage and can only be started direct-on-line. The motor
winding is internally connected into delta or star and 3 winding ends are connected to the
terminals U, V, W in the terminal box.
4.2.4 Star-delta m
otor (Y/∆) – Code E
T
his motor is interchangeable for star (Y) or delta (∆) operation by means of bridges. It is
suitable for two voltage ranges, eg, 220V-240V in delta, 380V-420V in star connection. If the
supply voltage and the nominal voltage of the motor in ∆-connection are identical, the star
connection motor can also be used for starting (remove bridges!).
4.2.5 Part-winding motor (YY/Y)
– Code A
PWS motors contain two separate windings (2/3 + 1/3) which are internally connected in star
and operated in parallel. You cannot change the voltage by changing the electrical connections.
The motor is only suitable for one voltage range.
The first part winding, the 2/3 winding on terminals 1-2-3 can be used for part winding start
(remove the bridges). After a time delay of 1 ± 0.1 seconds the second part winding, the 1/3
winding on terminals 7-8-9 must be brought on line.
4.3
Wiring diagrams
For wiring diagrams of recommended power and control circuit, please refer to our website at
Figure 14: Jumper position compressor motor
4.4
Protection devices
Independently from the internal motor protection, fuses must be installed before the compressor.
The selection of fuses has to be carried out according to VDE 0635, DIN 57635, IEC 269-1 or
EN 60269-1.
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